Part One: Measuring Redshifts




Дата канвертавання24.04.2016
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Law of Recession in terms of observables:

Part One: Measuring Redshifts

The hydrogen lines on the provided graphs were recorded, and using the formula and laboratory hydrogen lines from the skyserver site, the redshifts for each galaxy were logged (see attached #1). Then the corresponding galaxy was hypothesized: figure one’s graph most resembles a spiral of type ab, figure two also represents a spiral, but of type bc, and finally, figure three appears to resemble an irregular. Since the individual galaxy graphs have a different scale from the combined graph, it is possible that errors were made in matching the graphs, and our approximation was done by imperfect eyes.




Part Two: Making a Hubble Diagram





  1. Excel was used to determine the slope for two graphs; with NGC 4472 m=5.0657 and m=4.5211 without NGC 4472. (m equals slope, not magnitude in the previous sentence) We measured the relationship assuming the Universe is expanding generally uniformly. Information supporting this question can be found on attached #2.

  2. Finding our own Hubble Constant

c= 3x106 km s-1

z= 0.004 redshift NGC 4472

d= 22 Mpc

km s-1 Mpc-1



3. The plots do not fall directly because the relation between apparent magnitude and the log of the redshift is not exactly linear. The line represents the means, in that there should be data points both above and below the line. If data was extrapolated beyond the sample, the relation would be more true to the line. The luminosity (judging from m) is approximately half of the average first-ranked cluster galaxies. This is not very important because there should be dim galaxies (possible unseen) that will compensate for the variation and make the relation more directly linear and does not affect the Hubble constant.


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